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Öğe Comparative Study Using Chemical Wet Oxidation for Removal of Reactive Black 5 in the Presence of Activated Carbon(Asce-Amer Soc Civil Engineers, 2013) Ersoz, Guelin; Napoleoni, Alessandra; Atalay, SuheydaThe objective of this study was to assess the feasibility of various chemical wet oxidation techniques to remove azo dyes from wastewater. The performances of three different catalytic wet oxidation techniques were evaluated: catalytic wet air oxidation (CWAO), catalytic wet peroxide oxidation (CWPO), and hydrogen peroxide promoted wet air oxidation (PCWAO), using activated carbon as a catalyst to evaluate the degradation and decolorization of Reactive Black 5 in aqueous solution. The experiments were also conducted to investigate the optimum operating conditions of the processes, such as temperature, pH, activated carbon loading, H2O2 loading, and reaction time. This investigation revealed that all of the wet oxidation techniques showed similar results and rather high removal efficiencies, but at different operating conditions. At the optimized conditions, the degradation was generally approximately 85% and decolorization was nearly 95% in each case. The operating conditions were as follows: in the CWAO process, higher temperature (70 degrees C) and higher activated carbon loading (0.5g/L) were used; in the CWPO process, a lower temperature (0.25g/L) was used but a high amount of H2O2 was added (0.1mL/250mL solution); and in the PCWAO process, a lower amount of H2O2 was added (0.01mL/250mL solution) and higher temperature (70 degrees C) was necessary to achieve the required performance.Öğe Experimental assessment of a hybrid process including adsorption/photo Fenton oxidation and Microbial Fuel Cell for the removal of dicarboxylic acids from aqueous solution(Elsevier Science Sa, 2021) Civan, Gizem; Palas, Burcu; Ersoz, Guelin; Atalay, Sueheyda; Bavasso, Irene; Di Palma, LucaIn this study, the application of adsorption/photo Fenton oxidation and Microbial Fuel Cell was investigated for the degradation of dicarboxylic acids such as succinic acid and fumaric acid. The feasibility of a hybrid system combining an adsorption / photo Fenton-like oxidation and biological oxidation in a Microbial Fuel Cell (MFC) was investigated for the removal of succinic acid from aqueous solution. Adsorption and photo Fenton-like oxidation tests were carried out by using Fe-TiO2/AC (AC: Biomass derived activated carbon) as a catalyst. A removal of about 40.8 % was achieved in adsorption tests within 2 h at room temperature and 4 g/L of Fe-TiO2/AC loading. A slight improvement of the pollutant removal from the water phase was observed by the addition of an oxidant (H2O2) and the UV light source. The succinic acid solution was sent to a subsequent treatment in MFC: after 20 days a further removal of the pollutant of about 49.4 % with a mineralization of 35.5 % were observed. The adoption of a bioelectrochemical system allowed to convert the organics into electricity with a coulombic efficiency of 25.0 %. The biochemical oxidation of succinic acid and fumaric acid, the main product of the catalytic oxidation of succinic acid, was then carried out in a microbial fuel cell. A significant TOC reduction was achieved for both compounds, thus proving that they can be successfully used as electron source in microbial fuel cell treatment.